Void Storm

You tear apart the fabric of reality to create a portal to the Void centered on a point you can see within range. Dozens of inky-black, lightning-like tendrils lance out and dance around the portal in a 10 foot radius sphere. The tendrils snap towards the heads of any creatures within range of the portal, pouring visions of alien horrors into their minds, and they must each make a Wisdom saving throw. On a fail, a creature takes 3d8 psychic damage and falls prone from the shock of the visions. On a success, a creature takes half damage and does not fall prone.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage is increased by 1d8 per level above 2nd.